#ifndef __SIGNAL_PROCESS_H__
#define __SIGNAL_PROCESS_H__

#ifdef __cplusplus
extern "C" {
#endif

extern void dft(double *x, double *y, double *a, double *b, int n, int sign);

extern void fft(double *x, double *y, int n, int sign);

extern void fft4(double *x, double *y, int n);

extern void srfft(double *x, double *y, int n);

extern void rfft(double *x, int n);

extern void rlfft(double *x, int n);

extern void irfft(double *x, int n);

#ifdef __cplusplus
}
#endif

#endif